bfd:

bfd:

	* mach-o-i386.c (bfd_mach_o_section_type_valid_for_tgt): Define NULL.
	* mach-o-target.c (bfd_mach_o_backend_data): Initialize bfd_mach_o_section_type_valid_for_tgt
	* mach-o-x86-64.c (bfd_mach_o_section_type_valid_for_x86_64): New.
	(bfd_mach_o_section_type_valid_for_tgt): Set to bfd_mach_o_section_type_valid_for_x86_64.
	* mach-o.c (bfd_mach_o_section_type_name): Reorder and eliminate dup.
	(bfd_mach_o_section_attribute_name): Reorder.
	(bfd_mach_o_get_section_type_from_name): If the target has defined a validator for section
	types, then use it.
	* mach-o.h (bfd_mach_o_get_section_type_from_name): Alter declaration to include the bfd.

gas:

	* config/obj-macho.c (obj_mach_o_section): Account for target-dependent section
	types.  Improve error handling when wrong section types/attributes are specified.

gas/testsuite:

	* gas/mach-o/err-sections-1.s: New.
	* gas/mach-o/err-sections-2.s: New.
	* gas/mach-o/sections-3.d: New.
	* gas/mach-o/sections-3.s: New.